Form hanger for concrete slab structures



June 2s, 1938. G. B. Bosco 2,122,276

FORM HANGER FOR CONCRETE 'SLABI STRUCTURES Filed Aug. 25, 1937 2Sheets-Sheet l June 28, 1938. G. B. Boscol 2,22,276

FORM HANGER FOR CONCRETE SLAB STRUCTURES Filed Aug. 23, 19372-Sheets-Sheet 2 Patented June 28, 1938 UNITED STATES FFICE PATET FORMHANGER FOR CONCRETE SLAB STRUCTURES 9 Claims.

This invention relates to hangers for suspending the temporary formsused in the construction of concrete slabs such as decks, floors,ceilings, and the like.

In such constructions, the concrete slab is usually supported by aplurality of horizontal permanent girders, beams, or joists which may beI-beams or other structural steel shapes. The temporary forms span thespaces between the permanent beams and are suspended by hangers whichembrace the beams.

The main objects of this invention are to provide a hanger for slabforms having an improved yoke adapted for mounting on top of the beamand having improved Suspenders coupled to the yoke and adapted tosupport the temporary forms; to provide improved supporting and spacingchairs for supporting the yoke and for spacing it from the top of thebeam; to provide improved means for coupling the Suspenders to the yokeso as to permit the Suspenders to be removed from the embedded yokeafter the concrete has set whereby the Suspenders may be used over andover again; and to provide an improved hanger of this kind which issturdy and which may be quickly and accurately assembled and appliedeven by unskilled labor.

Illustrative embodiments of this invention are shown in the accompanyingdrawings, wherein:-

Figure 1 is a vertical section of a building structure showing one ofthe improved hangers;

Figure 2 is a perspective of the yoke part of the hanger shown in Figure1;

Figure 3 is a sectional detail of a hanger and building structureshowing a modified form of support and spacer for the yoke;

Figure 4 is an enlarged section of the yoke and spacer, the view beingtaken on the line 4-4 of Figure 3;

Figure 5 is a perspective of the yoke and spacers shown in Figures 3 and4;

Figure 6 is a horizontal section taken on the line 6 6 of Figure 5;

Figure '7 is a view similar to Figure 1 but showing an adjustable yokefor accommodating beams of different widths;

Figure 8 is a perspective of the adjustable yoke shown in Figure 7; and

Figure 9 is a perspective of one end of the adjustable yoke shown inFigure 8 and its attached supporting and spacing leg.

In the construction herein shown, the improved hangers are used inconnection with the construction of a concrete deck, iloor, or cei1 ingl which is supported on a plurality of joists, beams, or girders 2, onlyone of which is shown herein. These horizontal beams are usuallyarranged in substantially parallel spaced relation, and the spacesbetween the horizontal beams are spanned by the temporary forms whichare suspended from thev beams by the improved hangers.

In the construction herein shown, the temporary forms comprise the usualdecking 3 supported on horizontal joists 4 which are arranged insubstantially parallel spaced relation and which are in turn supportedby a plurality of pairs of stringers 5. The strngers of each pair arespaced apart so as to provide openings 6 through which the Suspenders ofthe improved hangers extend. Y

In the construction shown in Figure 1, each of the improved hangerscomprises a supporting yoke l supported on top of the beam and couu pledat its ends to a pair of depending suspenders 8 which support theforms.-

In the constructions shown in Figures 1, 2, 3, 5 and 6, the yoke is notadjustable and comprises a single bar which is preferably round incross-section and may be of any desired gauge which is sufficientlystrong for the work involved. The yoke bar is substantially U-shaped soas to provide depending arms 9 whichare externally threaded. These yokesare left embedded in the concrete deck after the concrete has set and,therefore, it is necessary to provide supporting and spacing means forraising the yokes above the lower surface of the deck. In

the construction sho-wn in Figures 1 and 2, such l f supporting andspacing means comprises a pair of legs i0 which are preferably sheetmetal stampings bent to substantially V-shape and being slightly longerthan the depending arms 9 so as to raise the lower extremities of thc=Iarms 9 above the plane of the lower face of the deck. As shown in Figure2, the upper ends of the'V-shaped legs il] are bent outwardly away fromeach other so as to provide flanges II- and I2. The flanges H areapertured so as to provide openings I3 through which the ends 9 of theyoke extend. The flanges I2 are permanently secured to the yoke bar byspot welding as shown at lll or by other suitable means.

In the construction shown in Figures 3, 4, 5 and 6, the supporting andspacing leg comprises a sheet metal stamping l5 of substantiallyinverted U-shape having strengthening ribs I6 in the leg portionsthereof and having a depression Il in the cross portion thereof forminga seatr` for the yoke bar. The yoke bar may be Spot welded to the legsI5 as shown at I8.

In the construction shown in Figures 7 and 8, the yoke portion of thehanger is adjustable widthwise so as to be adapted for use in connectionwith structural shapes of different widths. The adjustable yokecomprises a comparatively long bar I9 and a relatively short bar 20, theends of which are bent to form arms 2| and 22, respectively, which areexternally threaded similar to the arms 9. Attached to the outer end ofthe bar I8 is a supporting and spacing leg 23 which may be Similar inconstruction to the legs I0 or, if desired, may be similar inconstruction to the legs I5. The other leg of the adjustable yoke servesnot only as a supporting and spacing leg but also serves as a couplingfor slidably connecting the bars I9 and 20 together. As Shown in Figures7, 8 and 9, this coupling comprises a substantially V-Shape-d Sheetmetal stamping 24 having a pair of openings 25 formed therein forslidably receiving the bar I9 and having a pair of openings 25 formedtherein for receiving the short bar 2G. Struck out from the leg 24adjacent the openings 25, are lugs 2l which are Spot welded or otherwiserigidly secured to the bar 20. With this improved construction, the yokemay be adjusted as to width by merely sliding the leg 24 on the bar I 9.

Each of the Suspenders 8 is preferably of Substantially the Sameconstruction as the tie element Shown in my Patent No. 2,061,751, issuedNovember 24, 1936, and in my copending application, Serial No. 151,582,led July 2, 1937. It comprises a bolt having a tapered head 28 and aiiat shank 2S. The tapered head 28 extends through an opening 3&1 in thedecking 3 and has an internally threaded socket 3| for engagement withthe threaded ends of the yoke. The shank 29 is of rectangularcross-section with threads 32 formed on only two of the opposed Sidesthereof. With this type of construction, a wrench may be easily appliedto the at sides of the shank without injury to the threads. Engaging thethreaded portions of the Shanks 29 are wing nuts 33 having bearingportions 34 for engaging the lower faces of the Stringers 5.

In operation, the Suspenders are coupled to the yoke, and the yoke isthen placed on top of the beam with the Suspenders depending therefrom.The entire weight of the forms iS carried by the wing nuts 33, and thesewing nuts may be readily adjusted for bringing the upper surface of thedecking 3 to the required level which may be either above, below, or inthe plane of the upper surface of the beam.

-In dismantling the forms after the concrete has Set, the wing nuts 33are removed so as to permit dropping of the form parts, and thesuspenders 8 are then unscrewed from the threaded ends of the yokes. Theholes left in the bo-ttom face of the concrete after the removal of theSuspenders 8 may be readily plugged with concrete. The yokes remainpermanently embedded in the concrete.

Although but certain specic embodiments of this invention have beenherein Shown and described, it will be understood that details of theconstructions shown may be altered without departing from the spirit ofthe invention .as defined by the following claims:-

I claim:

1. A hanger adapted to suspend temporary forms from a beam in theconstruction of concrete slabs comprising a yoke adapted to remainembedded in the slab after the concrete has set, legs mounted on saidyoke for supporting said yoke on the beam and for spacing said yoke fromthe bottom face of the slab, a, pair of depending Suspenders threaded tothe ends of Said yoke So as to be adapted for removal of the Suspendersafter the concrete has set, and nuts on Said Suspenders for Supportingthe forms.

2. A hanger adapted to suspend temporary forms from a beam in theconstruction of concrete slabs comprising a yoke adapted to remainembedded in the slab after the concrete has set, said yoke beingadjustable in width for straddling beams of various widths, legsattached to and depending from Said yoke for supporting said yoke on andspaced above the beam, a pair of Suspenders -detachably coupled to theends of said yoke so as to permit removal of Said suspenders after theconcrete has Set, and means on said Suspenders for supporting the forms.

3. A hanger adapted to suspend temporary forms from a beam in theconstruction of concrete slabs comprising a yoke adapted to remainembedded in the slab after the concrete has set, said yoke beingextensible and retractable for accommodating beams of various widths,legs mounted on said yoke for supporting said yoke on the beam and forspacing said yoke from the bottom face of the slab, a pair of dependingsuspenders threaded to the ends of said yoke so as to be adapted forremoval of the Suspenders after the concrete has set, and nuts on saidSuspenders for Supporting the forms.

4. A hanger adapted to suspend temporary forms from a beam in theconstruction of concrete slabs comprising a yoke of Substantiallyinverted U-Shape having down-turned threaded ends, legs for Supportingsaid yoke on the beam and spacing said yoke from the bottom face of theslab, a pair of depending Suspenders having threaded engagement with theends of said yoke to permit removal of. the Suspenders after theconcrete has Set, and means on said Suspenders for supporting the forms.

5. A hanger adapted to suspend temporary forms from a beam in theconstruction of concrete slabs comprising a yoke of substantiallyinverted U-Shape having threaded ends, means for Supporting Said yoke onthe beam, said Supporting means being longer than Said yoke ends so asto position the extremities of said yoke above the plane of the top ofthe beam, a pair of depending suspenders having threaded engagement withthe ends of said yoke to permit removal of. the Suspenders after theconcrete has set, and means on said Suspenders for Supporting the forms.

6. A hanger adapted to suspend temporary forms from a beam in theconstruction of concrete slabs comprising a yoke adapted to remainembedded in the concrete and being of substantially inverted U-shapewith threaded ends, a pair of depending Suspenders at their upper endsthreaded to the ends of said yoke and having threaded lower portions,and nuts on said lower portions for supporting the forms, said nutsbeing vertically Shiftable for adjusting the forms either by therotation of Said nuts relative to Said Suspenders or by the rotation ofSaid Suspenders relative to Said yoke.

7. A hanger adapted to suspend temporary forms from a beam in theconstruction of concrete slabs comprising a yoke of Substantiallyinverted U-shape adapted to remain embedded in the concrete, means onthe ends of said yoke for supporting the forms, and a pair of supportinglegs Welded to said yoke adjacent the ends thereof.

8. A hanger adapted to suspend temporary forms from a beam in theconstruction of concrete slabs comprising a yoke of substantiallyinverted U-shape adapted to remain embedded in the concrete, said yokebeing in two sections slidably connected together to permit extensionand contraction thereof, means on the ends of said yoke for supportingthe forms, and a supporting leg mounted on said yoke and spot weldedthereto.

9. A hanger adapted to suspend temporary forms from a beam in theconstruction of. concrete slabs comprising a yoke adapted to remainembedded in the concrete, said yoke being in two sections to permitextension and contraction thereof, a pair of supporting legs mounted onsaid yoke, one of said legs serving as a coupling for slidablyconnecting said sections together, and Suspenders on the ends of saidyoke for supporting the forms.

GEORGE B. BOSCO.

